Hi <br><br><span id="result_box" class="long_text" lang="en"><span class="hps">I can get bounds of an actor to know that  </span><span class="hps">it is located in a</span> <span class="hps">range of</span> <span class="hps">situations</span> <span class="hps">in</span> renderwindow<span class="hps">.</span> <span class="hps">Course</span> <span class="hps">is</span> <span class="hps">a</span> object like cube,<br>
</span><br><span id="result_box" class="long_text" lang="en"><span class="hps">But</span> <span class="hps">if the</span> <span class="hps">object</span> <span class="hps">is</span> <span class="hps">irregular</span> <span class="hps">organ</span> <span class="hps">then</span> <span class="hps">draw</span> <span class="hps">a bounding box</span> <span class="hps">around</span> <span class="hps">the object</span></span><span id="result_box" class="long_text" lang="en"><span id="result_box" class="long_text" lang="en">, <span class="hps">it</span> <span class="hps">would be a</span> <span class="hps">black background</span> <span class="hps">(assuming</span> <span class="hps">the object</span> <span class="hps">is</span> <span class="hps">white</span><span>) </span></span> <span class="hps">in</span> <span class="hps">some</span> <span class="hps">situations.</span><span></span><br>
<span class="hps"></span><br><span class="hps">In fact I want to  know </span></span><span id="result_box" class="long_text" lang="en"><span class="hps"><span id="result_box" class="long_text" lang="en"><span class="hps"><span id="result_box" class="long_text" lang="en"><span class="hps"><span id="result_box" class="long_text" lang="en"><span class="hps">which </span></span></span></span>positions, </span></span></span></span><span id="result_box" class="long_text" lang="en"><span class="hps"><span id="result_box" class="long_text" lang="en"> <span class="hps">the value of them is zero(black)</span></span>  in this bounding box of </span> <span class="hps">the</span> <span class="hps">actor</span></span>,<br>
(like the some voxel of it is zero )<br> <br>now Do I use from what command in vtk?<br><br>thanks alot<br><br><br>